package com.bwie.filter;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.Ordered;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.concurrent.TimeUnit;

@Configuration
public class MyFilter implements GlobalFilter, Ordered {
    @Autowired
    StringRedisTemplate stringRedisTemplate;
    /**
     * 网关全局过滤器
     * @param exchange
     * @param chain
     * @return
     */
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //获取参数
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        String url = request.getURI().getPath();
        System.out.println("url"+url);

        //白名单
        if(url.contains("/login") || url.contains("/sendCode")){
            System.out.println("白名单" +url);
            return chain.filter(exchange);
        }
        //检查token
        String token = request.getHeaders().getFirst("token");
        if (token ==null){
            System.out.println("token为空"+url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        Claims body = Jwts.parser().setSigningKey("123456").parseClaimsJws(token).getBody();
        Integer userId = body.get("userId", Integer.class);
        String tokenKey = "token-"+userId;
        String redisToken = stringRedisTemplate.opsForValue().get(tokenKey);
        if(redisToken ==null){
            System.out.println("token已过期"+url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        if(!token.equals(redisToken)){
            System.out.println("token错误"+url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //token续期
        stringRedisTemplate.expire(tokenKey,15, TimeUnit.MINUTES);

        //放行
        System.out.println("放行"+url);
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
